18137684 has 6 divisors (see below), whose sum is σ = 31740954. Its totient is φ = 9068840.

The previous prime is 18137641. The next prime is 18137687. The reversal of 18137684 is 48673181.

It can be written as a sum of positive squares in only one way, i.e., 15382084 + 2755600 = 3922^2 + 1660^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18137687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2267207 + ... + 2267214.

It is an arithmetic number, because the mean of its divisors is an integer number (5290159).

Almost surely, 2^18137684 is an apocalyptic number.

It is an amenable number.

18137684 is a deficient number, since it is larger than the sum of its proper divisors (13603270).

18137684 is a wasteful number, since it uses less digits than its factorization.

18137684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4534425 (or 4534423 counting only the distinct ones).

The product of its digits is 32256, while the sum is 38.

The square root of 18137684 is about 4258.8359912070. The cubic root of 18137684 is about 262.7406542871.

The spelling of 18137684 in words is "eighteen million, one hundred thirty-seven thousand, six hundred eighty-four".